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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Phospholipase DZ2 plays an important role in extraplastidic galactolipid biosynthesis and phosphate recycling in Arabidopsis roots
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Phospholipase DZ2 plays an important role in extraplastidic galactolipid biosynthesis and phosphate recycling in Arabidopsis roots

机译：磷脂酶DZ2在拟南芥根的质外半乳糖脂生物合成和磷酸盐回收中起重要作用

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摘要

Low phosphate (Pi) availability is one of the major constraints for plant productivity in natural and agricultural ecosystems. Plants have evolved a myriad of developmental and biochemical mechanisms to increase internal Pi uptake and utilization efficiency. One important biochemical pathway leading to an increase in internal Pi availability is the hydrolysis of phospholipids. Hydrolyzed phospholipids are replaced by nonphosphorus lipids such as galactolipids and sulfolipids, which help to maintain the functionality and structure of membrane systems. Here we report that a member of the Arabidopsis phospholipase D gene family (PLDZ2) is gradually induced upon Pi starvation in both shoots and roots. From lipid content analysis we show that an Arabidopsis pldz2 mutant is defective in the hydrolysis of phospholipids and has a reduced capacity to accumulate galactolipids under limiting Pi conditions. Morphological analysis of the pldz2 root system shows a premature change in root architecture in response to Pi starvation. These results show that PLDZ2 is involved in the eukaryotic galactolipid biosynthesis pathway, specifically in hydrolyzing phosphaticlylcholine and phosphaticlylethanolamine to produce diacylglycerol for digalactosyldiacylglycerol synthesis and free Pi to sustain other Pi-requiring processes.
机译：磷酸盐（Pi）的低可用性是自然和农业生态系统中植物生产力的主要限制之一。植物已经进化了无数的发育和生化机制来增加内部Pi的吸收和利用效率。导致内部Pi利用率增加的重要生化途径之一是磷脂的水解。水解的磷脂被无磷脂质（如半乳糖脂和硫脂）取代，这有助于维持膜系统的功能和结构。在这里，我们报告拟南芥磷脂酶D基因家族（PLDZ2）的成员是在Pi饥饿时在芽和根中逐渐诱导的。通过脂质含量分析，我们发现拟南芥pldz2突变体在磷脂的水解中存在缺陷，并且在有限的Pi条件下具有降低的积累半乳糖脂的能力。对pldz2根系统的形态学分析表明，响应Pi饥饿，根结构发生了过早的变化。这些结果表明，PLDZ2参与真核半乳糖脂的生物合成途径，特别是水解磷脂酰胆碱和磷脂酰乙醇胺以生产用于二半乳糖基二酰基甘油合成的二酰基甘油和游离的Pi来维持其他需要Pi的过程。

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